diff --git a/Cargo.toml b/Cargo.toml
index e9e14fa6..3907a3ac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ num-complex = { version = "0.3", optional = true }
 paste = { version = "0.1.6", optional = true }
 pyo3cls = { path = "pyo3cls", version = "=0.11.1", optional = true }
 unindent = { version = "0.1.4", optional = true }
-hashbrown = { version = "0.8", optional = true }
+hashbrown = { version = "0.9", optional = true }
 
 [dev-dependencies]
 assert_approx_eq = "1.1.0"